系统管理职责超出 Linux 内核边界
硬件演讲说明整机的资源与保护职责横跨 Linux 和外围固件；systemd 演讲则把用户态动态服务纳入系统层。两者都要求从实际管理职责出发画系统边界，避免把一个内核当成全部系统。
对照原文
the operating system for this machine includes linux as a component but it also has to include all the restsystemd as a project ends up complementing the linux kernel by providing all of this user space system layer外围固件与 systemd 不是同一层，也不互相替代；共同点仅是系统职责边界大于 Linux 内核。